CN213294695U - Phosphoric acid production device capable of reducing insoluble phosphorus content - Google Patents
Phosphoric acid production device capable of reducing insoluble phosphorus content Download PDFInfo
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- CN213294695U CN213294695U CN202022146105.1U CN202022146105U CN213294695U CN 213294695 U CN213294695 U CN 213294695U CN 202022146105 U CN202022146105 U CN 202022146105U CN 213294695 U CN213294695 U CN 213294695U
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Abstract
The utility model discloses a phosphoric acid production device capable of reducing insoluble phosphorus content, belonging to the technical field of phosphoric acid preparation. The device comprises a concentrated sulfuric acid storage tank, a filter, an acid-reaction tank, a plurality of reaction kettles and an acid mixer, wherein the reaction kettles are sequentially communicated, the acid-reaction tank is arranged on a second reaction kettle, the number of the reaction kettles is 5-7, the acid-reaction tank is connected with the first reaction kettle and the filter, and the filter is connected with the last reaction kettle; two feed inlets of the acid mixer are respectively connected with the acid-returning tank and the concentrated sulfuric acid storage tank, and a discharge outlet of the acid mixer extends into the liquid level of the second reaction kettle; and the third reaction kettle is connected with a concentrated sulfuric acid storage tank. The device avoids local supersaturation and local high temperature with the mode that returns acid and sulphuric acid mix the dilution before getting into the reaction tank, and the effect that returns acid can play reaction slurry concentration in the dilution reaction tank simultaneously reduces the viscosity of reaction slurry, and this is all very useful to the reactivity of increasing the phosphorus ore, improves the calcium sulphate crystallization, and the content of insoluble phosphorus reduces to below 0.65% in the phosphoric acid of preparation.
Description
Technical Field
The utility model belongs to the technical field of phosphoric acid preparation, in particular to can reduce phosphoric acid apparatus for producing of insoluble phosphorus content.
Background
The wet production is to decompose the powdered rock phosphate with inorganic acid, separate out the crude phosphoric acid, and then purify to obtain the phosphoric acid product. The cost of the wet-process phosphoric acid is 20-30% lower than that of the phosphoric acid by a thermal method, and the purity of the product can be comparable to that of the phosphoric acid by the thermal method after the phosphoric acid is purified by a proper method. The wet process phosphoric acid process is dominated by phosphoric acid production.
The existing phosphoric acid preparation process comprises the following steps: the phosphoric ore pulp, the reverse acid and the sulfuric acid react in a reaction kettle (usually a plurality of reaction kettles) to obtain phosphoric acid and phosphogypsum, a filter filters reaction liquid to obtain crude phosphoric acid, phosphogypsum and the reverse acid, the crude phosphoric acid is sent to a flash tower to be flashed to realize concentration, and tail gas generated by the reaction kettle and tail gas vacuumized by the flash tower are sent to a tail gas treatment device to be washed by water to obtain the fluosilicic acid. The number of the reaction kettles is usually 5-7, the phosphorite pulp and the counter acid are added into the first reaction kettle, the concentrated phosphoric acid is added into the second reaction kettle, the reaction kettle is finally output to a filter, and the concentrated sulfuric acid is supplemented into other reaction kettles according to the requirements.
The pure phosphorite reacts with the sulfuric acid, the decomposition rate of the phosphorite is very low, and because calcium sulfate generated by the reaction of the phosphorite and the sulfuric acid cannot be dispersed into a liquid phase in time and is coated on the surface of the phosphorite, the continuous reaction of the phosphorite and the sulfuric acid is prevented, and a proper liquid phase environment needs to be provided for the reaction of the phosphorite and the sulfuric acid by acid returning. The sulfuric acid used in the actual production is 98% concentrated sulfuric acid, local supersaturation of the sulfuric acid and overhigh local temperature are easily formed at the adding point of the sulfuric acid, the generation and growth of calcium sulfate crystals can be greatly influenced, the rear end separation and washing of reaction slurry are not facilitated, the content of insoluble phosphorus is high (0.8%), and the phosphorus yield is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the embodiment of the utility model provides a can reduce phosphoric acid apparatus for producing of insoluble phosphorus content will return sour and concentrated sulfuric acid and mix the mode of diluting before getting into the reaction tank and avoid local supersaturation and local high temperature, return sour effect that can play the dilution reaction tank in reaction slurry concentration simultaneously, reduce the viscosity of reaction slurry, this is all very beneficial to the reactivity that increases the phosphorus ore, improve the calcium sulfate crystallization. The technical scheme is as follows:
the embodiment of the utility model provides a phosphoric acid production device capable of reducing insoluble phosphorus content, the device comprises a concentrated sulfuric acid storage tank, a filter, an acid-returning groove, a plurality of reaction kettles 7 which are sequentially communicated and an acid mixer arranged on a second reaction kettle, the number of the reaction kettles 7 is 5-7, the acid-returning groove is connected with the first reaction kettle and the filter, and the filter is connected with the last reaction kettle; two feed inlets of the acid mixer are respectively connected with the acid-returning tank and the concentrated sulfuric acid storage tank, and a discharge outlet of the acid mixer extends into the liquid level of the second reaction kettle; and the third reaction kettle is connected with a concentrated sulfuric acid storage tank.
The acid mixer in the embodiment of the utility model is vertically arranged and comprises an outer sleeve 1 with a conical bottom, a sulfuric acid feeding pipe 2 coaxially arranged in the outer sleeve 1 and a reverse acid feeding pipe 3 arranged at the upper part of the outer sleeve 1; the outer sleeve 1 is vertically arranged, the upper end of the outer sleeve is closed, and the lower end of the outer sleeve extends into the liquid level of the second reaction kettle; the sulfuric acid feeding pipe 2 is fixed on the upper end of the outer sleeve 1, the lower end of the sulfuric acid feeding pipe extends to the lower part of the outer sleeve 1, and the acid-returning feeding pipe 3 is obliquely and upwards arranged on the outer sleeve 1.
Further, the embodiment of the present invention provides an upper flange 4 is coaxially arranged on the top end of the outer sleeve 1, an upper flange 5 matched with the upper flange 4 is coaxially arranged on the upper portion of the sulfuric acid feeding pipe 2, and the upper flange 5 and the lower flange 4 are fixed together by bolts and nuts and are provided with a gasket therebetween.
Further, the embodiment of the utility model provides an in the middle part of outer tube 1 is coaxial to be equipped with mounting flange 6, mounting flange 6 passes through the bolt and fixes the top at the second reation kettle with the nut.
Specifically, the inner diameter of the outer sleeve 1 in the embodiment of the present invention is 180-; the inner diameter of the sulfuric acid feeding pipe 2 is 50-80mm, and the distance between the lower end of the sulfuric acid feeding pipe and the lower end of the outer sleeve 1 is 400-700 mm; the inner diameter of the acid-return feeding pipe 3 is 130-170mm, and the distance between the lower end of the acid-return feeding pipe and the upper end of the outer sleeve 1 is 300-500 mm.
Preferably, the inner wall of the outer sleeve 1 and the part of the outer wall thereof below the fixing flange 6 in the embodiment of the present invention are both provided with a tetrafluoroethylene coating, the inner wall of the sulfuric acid feeding pipe 2 and the part of the outer wall thereof inside the outer sleeve 1 are both provided with a tetrafluoroethylene coating, and the inner wall of the acid-return feeding pipe 3 is provided with a tetrafluoroethylene coating.
Specifically, the embodiment of the present invention provides a reaction kettle 7 with 6 number, which is provided with a stirrer and an exhaust port at the top.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the embodiment of the utility model provides a can reduce phosphoric acid apparatus for producing of insoluble phosphorus content, the device will return sour and concentrated sulfuric acid and mix the mode of diluting before getting into the reaction tank and avoid local supersaturation and local high temperature, return sour effect that can play the reaction slurry concentration in diluting the reaction tank simultaneously, reduce the viscosity of reaction slurry, this is all very beneficial to the reactivity that increases the phosphorus ore, improve the calcium sulfate crystallization, the content of insoluble phosphorus reduces to below 0.65% in the phosphoric acid of preparation.
Drawings
FIG. 1 is a schematic block diagram of a phosphoric acid production apparatus capable of reducing the content of insoluble phosphorus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a reaction kettle and acid mixer combination provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an acid mixer provided by an embodiment of the present invention.
In the figure: 1 outer sleeve, 2 sulphuric acid feed pipes, 3 acid-return feed pipes, 4 lower flanges, 5 upper flanges, 6 fixed flanges and 7 reaction kettles.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1-3, the embodiment of the utility model provides a can reduce phosphoric acid apparatus for producing of insoluble phosphorus content, the device include concentrated sulfuric acid storage tank (be used for providing concentrated sulfuric acid), filter (be used for filtering the phosphoric acid after the reaction, specifically be carousel vacuum filter), anti-acid tank (be used for storing anti-acid) and a plurality of reation kettle 7 (unanimous with conventional technology, set up side by side or be the array setting) that communicate gradually etc.. Wherein, the number of reation kettle 7 is 5-7, and the sour groove of returning is used for will collecting the sour of returning and will return sour and send into first reation kettle with the filter through tube coupling, and the filter passes through the pipeline and is connected with last reation kettle. The structure is basically the same as that of the existing phosphoric acid production device, and the difference is that: the phosphoric acid production device in this embodiment further includes an acid mixer (for mixing part of the reverse acid (25-50% of the total amount of the reverse acid) and part of the concentrated phosphoric acid) arranged on the second reaction kettle, two feed inlets (a sulfuric acid inlet and a reverse acid inlet) of the acid mixer are respectively connected with the acid reaction tank (for adding the remaining reverse acid) and the concentrated sulfuric acid storage tank (50-75% of the total amount of the sulfuric acid) through pipelines, and a discharge outlet of the acid mixer extends into the liquid level of the second reaction kettle. The third reaction kettle is connected with a concentrated sulfuric acid storage tank (adding the residual sulfuric acid) through a pipeline, the sulfuric acid is not added into other reaction kettles 7 except the second reaction kettle and the third reaction kettle, and the reaction kettle 7 behind the third reaction kettle is used for further reacting the phosphate rock slurry with the sulfuric acid.
Referring to fig. 2 and 3, the acid mixer in the embodiment of the present invention is vertically disposed, and includes an outer sleeve 1 (tubular structure) with a bottom being a cone shape (a cone with a large top and a small bottom), a sulfuric acid feeding pipe 2 (tubular structure) coaxially disposed in the outer sleeve 1, and an acid-returning feeding pipe 3 (tubular structure) disposed on the upper portion of the outer sleeve 1. Wherein, the outer sleeve 1 is vertically arranged, the upper end thereof is closed (positioned outside the second reaction kettle), and the lower end thereof extends into the liquid level of the second reaction kettle. The sulfuric acid feeding pipe 2 is fixed on the upper end of the outer sleeve 1, the upper end (provided with a flange (specifically a flange connected with DN 65) serving as a sulfuric acid inlet) thereof penetrates out of the top end of the outer sleeve 1 upwards, and the lower end thereof reaches the lower part of the outer sleeve 1. The acid-returning feed pipe 3 is obliquely arranged upwards (the specific angle can be 45 degrees) on the outer sleeve 1 and is coplanar with the outer sleeve 1, and the upper end of the acid-returning feed pipe is provided with a flange (specifically a flange connected with DN 150) as an acid-returning inlet.
Further, referring to fig. 2 and 3, the top end of the outer sleeve 1 in the embodiment of the present invention is coaxially provided with a lower flange 4, the upper portion of the sulfuric acid feeding pipe 2 is coaxially provided with an upper flange 5 engaged with the lower flange 4, and the lower flange 4 and the upper flange 5 are fixed together by bolts and nuts and are provided with a gasket therebetween (for sealing).
Further, referring to fig. 2 and 3, the middle portion of the outer sleeve 1 in the embodiment of the present invention is coaxially provided with a fixing flange 6, the fixing flange 6 is fixed on the top of the second reaction vessel by bolts and nuts, the diameter thereof is 650 plus 750mm, the lower side thereof can be provided with a tetrafluoroethylene coating, and the tetrafluoroethylene coating is located below the acid-resisting feeding pipe 3.
Specifically, the inner diameter of the outer sleeve 1 in the embodiment of the present invention is 180-. The inner diameter of the sulfuric acid feeding pipe 2 is 50-80mm, the distance between the lower end of the sulfuric acid feeding pipe and the lower end of the outer sleeve 1 is 400-700mm, and the distance between the upper end of the sulfuric acid feeding pipe and the upper end of the outer sleeve 1 is 70-120 mm. The inner diameter of the acid-return feeding pipe 3 is 130-170mm, the distance between the lower end of the acid-return feeding pipe and the upper end of the outer sleeve 1 is 300-500mm, and the length of the acid-return feeding pipe is 250-400 mm. The thickness of the outer sleeve 1, the sulfuric acid feeding pipe 2 and the acid-returning feeding pipe 3 is 3-10 mm.
Preferably, in order to avoid corrosion of the acid mixer, the inner wall of the outer sleeve 1 and the part of the outer wall thereof below the fixing flange 6 are provided with tetrafluoroethylene coatings, the inner wall of the sulfuric acid feeding pipe 2 and the part of the outer wall thereof inside the outer sleeve 1 are provided with tetrafluoroethylene coatings, and the inner wall of the acid-returning feeding pipe 3 is provided with tetrafluoroethylene coatings.
Specifically, the embodiment of the utility model provides an in 7's quantity be 6 (be 2 and arrange, every 3 of arranging), be equipped with the agitator in it (the setting of acid mixing ware will avoid causing the influence to the agitator), its top is equipped with the gas vent.
In the embodiment, a pump, a valve, a flowmeter, and/or the like are/is provided on the pipeline as required. In this embodiment, "first", "second", and "third" only have a distinguishing function, and have no other special meaning.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. A phosphoric acid production device capable of reducing insoluble phosphorus content comprises a concentrated sulfuric acid storage tank, a filter, an acid reaction tank and a plurality of reaction kettles (7) which are sequentially communicated, wherein the number of the reaction kettles (7) is 5-7, the acid reaction tank is connected with a first reaction kettle and the filter, and the filter is connected with a last reaction kettle; the acid mixing device is characterized by also comprising an acid mixing device arranged on the second reaction kettle; two feed inlets of the acid mixer are respectively connected with the acid-returning tank and the concentrated sulfuric acid storage tank, and a discharge outlet of the acid mixer extends into the liquid level of the second reaction kettle; and the third reaction kettle is connected with a concentrated sulfuric acid storage tank.
2. A phosphoric acid production apparatus capable of reducing the content of insoluble phosphorus according to claim 1, wherein the acid mixer is vertically arranged and comprises an outer sleeve (1) with a conical bottom, a sulfuric acid feeding pipe (2) coaxially arranged in the outer sleeve (1) and an acid-returning feeding pipe (3) arranged at the upper part of the outer sleeve (1); the outer sleeve (1) is vertically arranged, the upper end of the outer sleeve is closed, and the lower end of the outer sleeve extends into the liquid level of the second reaction kettle; the sulfuric acid feeding pipe (2) is fixed on the upper end of the outer sleeve (1) and the lower end of the sulfuric acid feeding pipe extends to the lower part of the outer sleeve (1), and the acid-returning feeding pipe (3) is obliquely and upwards arranged on the outer sleeve (1).
3. The phosphoric acid production device capable of reducing the content of insoluble phosphorus according to claim 2, wherein the top end of the outer sleeve (1) is coaxially provided with a lower flange (4), the upper part of the sulfuric acid feeding pipe (2) is coaxially provided with an upper flange (5) matched with the lower flange (4), and the lower flange (4) and the upper flange (5) are fixed together through bolts and nuts with a gasket arranged therebetween.
4. The apparatus for producing phosphoric acid with reduced content of insoluble phosphorus according to claim 2, wherein the outer sleeve (1) is coaxially provided with a fixing flange (6) at the middle part thereof, and the fixing flange (6) is fixed on the top of the second reaction vessel by bolts and nuts.
5. The apparatus for producing phosphoric acid with reduced insoluble phosphorus content as claimed in claim 2, wherein the outer casing (1) has an inner diameter of 180-250mm, a length of 1500-2100mm and an inner diameter of the bottom end of 120-145 mm; the inner diameter of the sulfuric acid feeding pipe (2) is 50-80mm, and the distance between the lower end of the sulfuric acid feeding pipe and the lower end of the outer sleeve (1) is 400-700 mm; the inner diameter of the acid-return feeding pipe (3) is 130-170mm, and the distance between the lower end of the acid-return feeding pipe and the upper end of the outer sleeve (1) is 300-500 mm.
6. A phosphoric acid production apparatus capable of reducing the content of insoluble phosphorus according to claim 4, wherein the inner wall of the outer jacket tube (1) and the portion of the outer wall thereof located below the fixing flange (6) are provided with a tetrafluoroethylene coating, the inner wall of the sulfuric acid feed tube (2) and the portion of the outer wall thereof located inside the outer jacket tube (1) are provided with a tetrafluoroethylene coating, and the inner wall of the reverse acid feed tube (3) is provided with a tetrafluoroethylene coating.
7. The apparatus for producing phosphoric acid with reduced content of insoluble phosphorus according to claim 1, wherein the number of the reaction vessels (7) is 6, and a stirrer is provided therein and a vent is provided at the top thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022146105.1U CN213294695U (en) | 2020-09-27 | 2020-09-27 | Phosphoric acid production device capable of reducing insoluble phosphorus content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022146105.1U CN213294695U (en) | 2020-09-27 | 2020-09-27 | Phosphoric acid production device capable of reducing insoluble phosphorus content |
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| Publication Number | Publication Date |
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| CN213294695U true CN213294695U (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022146105.1U Active CN213294695U (en) | 2020-09-27 | 2020-09-27 | Phosphoric acid production device capable of reducing insoluble phosphorus content |
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